Welcome to Fixya. If you want to rese the Bios password you need to remove the Bios battery on the system then turn it on then connect the battery again. If your not familiar on how to do it the service manual is provided below so that you can disassemble the system.

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Related Questions:

try to remove bios battery on the inside and short the pins with something iron like a screwdriver for a few seconds, remove the battery pack too when doing this, you should be fine after that,
ps. you might need to set some bios parameters when starting up again

try Admin or Administrator Or it may be blank, just try to hit enter w/o entering anything at all. Good luck. Or when it boots up F8 and run it in Safe Mode. Many ppl never put a password for Admin. I've gotten into many computers that way.

Yvette Escobar,
In order to reset the bios passwords you will need to contact Dell Support. They will need to verify ownership of the system and then will provide information to reset the password. If you are in the US the number to call is 1-877-624-9896.
Thank You,
Dell-Jesse L
Dell Social Media and Communities

There is no way to "find" the BIOS password, as it is embedded in the computer's hardware. There is a DIY for resetting it here: http://www.ianmcshane.org/2009/10/01/clearing-the-bios-password-on-a-dell-d610/
The easiest way to get back into BIOS is by replacing the motherboard or having a shop perform the aforementioned procedure.

Dell Laptop with bios or hard drive password set ? Unlock your dell laptop using the link below if it display a message that says "this computer system is protected by a password authentication system, you cannot access the data on this computer without the primary or administrator password, when you turn on the computer. This message is what you get if the BIOS is protected by a password. or you get system disabled